Software Engineer · USMC veteran · San Bruno, CA

Maung Htike

Payments engineer → AI platform architect

Production software where fintech precision meets agentic AI — from B2B payments moving millions of dollars daily to a multi-agent platform architected end-to-end.

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About

Engineering across payments and technology.

Maung Htike U.S. Marine Corps veteran

Software engineer with nearly a decade of hands-on experience spanning hardware and software — from electro-optical systems and reliability testing into full-stack and backend engineering. Spent ~3 years shipping production Ruby on Rails on Corpay's (NYSE: CPAY) B2B payments platform moving millions of dollars daily; now an architect and a founding engineer building a multi-tenant procure-to-pay platform end-to-end through a self-designed multi-agent AI workflow on Claude Code.

A U.S. Marine Corps veteran based in San Bruno, CA, with a decade spent making things reliable — from optics and solar panels to payment pipelines. Careful review, measurable quality gates, and full ownership end-to-end.

Experience

Nearly a decade of technical experience.

May 2026 — Present Remote

Senior Software Engineer / Founding Engineer

· Stealth Startup (Fintech · P2P SaaS)

Architect and a founding engineer building a multi-tenant procure-to-pay platform from an empty repository to production — 30+ Rails 8 models and a Stripe Custom Connect payments engine spanning multi-tenancy, default-deny RBAC, vendor management, purchase orders, invoice automation, chart of accounts, and double-entry journals, across 40+ reviewed, CI-gated pull requests.
Built the core backend hands-on: a database-driven, default-deny authorization layer (Pundit); tokenized vendor onboarding, funding methods, virtual cards, and webhook reconciliation; and reusable primitives for gap-free document numbering, soft-deletes, and audit logging — with strict cross-organization data isolation and encrypted sensitive records.
Delivered the platform end-to-end through a self-designed multi-agent AI workflow on Claude Code — 13 archetyped agents carry each feature from concept through planning, implementation, and pull-request review, with fresh-context reviewers adversarially grading every plan and PR against a fixed rubric behind human-gated approval on commits and risky database migrations.
Released a project-agnostic version of that workflow as the open-source "Maung's Agentic Toolbelt" — 16 agents and 9 skills that take work from a raw idea to a security-reviewed, merge-ready pull request, with strict planner/implementer separation and MCP integrations for GitHub and Playwright.
Enforced zero-regression quality gates on AI-generated code: a 2,200+-example RSpec suite at a ~2:1 test-to-code ratio, plus linting and build, run on every commit and push and mirrored exactly in CI.

Apr 2023 — Feb 2026 San Mateo, CA

Software Engineer

· Corpay (NYSE: CPAY) (Promoted from QA Analyst)

Took full ownership of the file-integration system — the platform's most critical pipeline — on a SaaS processing millions of dollars in payments daily for clients up to enterprise scale; delivered 1,670+ commits, 250+ tickets, and 27,000+ lines across Rails, AngularJS, React, and Cypress.
Scaled the bulk invoice-ingestion pipeline from 5,000 to 300,000 records per batch — parallel Sidekiq workers parse and de-duplicate rows, build invoices, and link them to a single source-document payment, tuned with database indexing, uniqueness constraints, and job-level concurrency controls.
Built and maintained the Corpay/NVP payment-processor integration (125+ changes via REST and SOAP): posting approved payments, reconciling both systems through webhook-driven polling, and issuing vendor virtual cards via Comdata — instrumented end to end with Honeybadger, Datadog, and CloudWatch.
Resolved a SEV-1 payment-routing incident in an all-hands response — a batch had routed a customer's full ~$500K to a single vendor; traced it through CloudWatch and voided every transaction before funds left the originating account, then hardened multi-vendor chunking with pre-production verification.
Reviewed ~400 pull requests as a primary reviewer, mentored new engineering hires on architecture and payment workflows, and partnered with product owners and stakeholders to translate business requirements into technical solutions.

Feb 2023 — Apr 2023 San Francisco, CA

Pit Crew Operator

· Cruise (Autonomous Vehicles)

Ran daily readiness inspections on autonomous vehicles ahead of self-driving reliability testing, keeping the test fleet operational and on schedule.
Synced each vehicle's onboard software to the correct development branch before AV runs and proactively surfaced issues that could disrupt testing.

Jun 2019 — Jul 2020 Berkeley, CA

Solar Test Technician

· PV Evolution Labs (PVEL) (Night-Shift Lead)

Night-shift lead for a reliability-testing team — ran performance and durability tests on solar equipment, validated measurement data, logged it to a structured database, and re-ran tests when results fell outside tolerance.
Trained junior technicians on test procedures and result logging, and co-built a sorting system that streamlined intake, organization, and export of solar panels and equipment.

Jun 2018 — Jun 2023 veteran

Electro-Optical Ordnance Repairer

· United States Marine Corps

Held a U.S. Government Secret security clearance (since expired) and trained military personnel on confidential electro-optical systems — thermals, night vision, and laser rangefinders valued from thousands to hundreds of thousands of dollars.
Tested and repaired thermal and laser optics with military test equipment and technical manuals, replacing components to return equipment to optimal performance.

See the whole journey on LinkedIn ↗

Featured work

Two projects in focus.

A traditional Norse board game recreated for modern times, and a multi-agent AI system behind a production platform rebuild.

TAFL

LIVE

A web implementation of the ancient Norse strategy game Tafl (hnefatafl) — two-player couch play on a single shared device.

A full-stack hnefatafl game for local two-player couch play — two people share one device and alternate turns on the same board. A React 19 + TypeScript client (Zustand for game state) calls a Rails 7 JSON API that validates moves and stores games in PostgreSQL.

Frontend

React 19ViteTypeScriptZustandEmotion

Backend

Rails 7.1PostgreSQLPumarack-cors

Live demo ↗ Frontend ↗ Backend ↗

AI Orchestration Workflow

Maung's Agentic Toolbelt

BETA

A project-agnostic, human-gated Claude Code toolbelt — 16 agents and 9 skills that carry work from a raw idea to a security-reviewed, merge-ready pull request, and keep a codebase's docs current on their own.

A standalone, open-source release: dedicated agents and skills for planning, implementation, review, security review, bug diagnosis, chores, handoffs, and a self-maintaining wiki — with zero-context "fresh-eyes" reviewers, rubric-scored verdicts, always-on guardrail hooks, and MCP integrations for GitHub and Playwright. It auto-detects each host project's conventions and installs as a Claude Code plugin, generalizing the workflow used to deliver a multi-tenant procure-to-pay platform end-to-end.

Claude CodeMCPAdversarial evalsPlaywrightRSpec / RuboCop CIAgent handoffs

Source ↗

Selected work

Additional projects.

Maung & Rose Wedding

LIVE

A wedding website with a vintage visual design and all of the components to ensure that guests will be able to RSVP and also have all the information they need for the event. Feel free to RSVP but the event is long over though...

Next.js 14ReactTypeScriptTailwindFramer MotionHeadless UI

Live demo ↗

Timesheet Manager

LIVE

A full-stack timesheet and line-item tracker: account creation, CRUD on timesheets and line items, and auto-summed minutes and cost with JWT auth.

MongoDBExpressReactNode.jsApollo / GraphQLJWTBcryptBootstrap

Live demo ↗ Repo ↗

Memory Lane

LIVE

A timeline generator for building clean, shareable personal timelines — sign up, create timelines, and add chronologically-ordered "moments" with images and dates.

MongoDBExpressReactNode.jsApollo / GraphQLJWTReact RouterTailwind

Live demo ↗ Repo ↗

Active Project

Odyssa

COMING SOON

A 1-bit pixel-horror descent into the sealed catacombs beneath a city that has known too much war.

In development. Live today is a teaser landing and concept board.

GODOT

View teaser ↗

Skills

The toolkit.

AI Engineering

Agentic orchestrationMulti-agent system designClaude Code (subagents, skills, pipelines)MCP (Model Context Protocol)Prompt & rubric engineeringAdversarial evaluation loopsHuman-in-the-loop gating

AI Reliability & Evals

Eval gates for AI-generated codeBrowser-automation verification (Playwright)Least-privilege agent tool scopingToken budgetingStructured agent handoffs

Languages & Frameworks

JavaScriptTypeScriptRubySQLReactAngularJSNode.jsExpress.jsRuby on Rails

Data & Infrastructure

PostgreSQLMySQLElasticsearchRedisAWS (S3, EC2, RDS, CloudWatch)DockerSidekiqSFTP

Testing & Observability

CypressTDDPostmanRunscopeHoneybadgerDatadog

APIs & Tools

RESTful API designSOAPSAML SSOComdataCorpay / NvoicePayGit & GitHubJIRAAgile / ScrumFigma

Contact

Get in touch.

Open to engineering and tech roles. Use the form, or any of the direct links below.

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